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Self-lubricating bearing and coating

a self-lubricating, bearing technology, applied in the direction of sliding contact bearings, bearings, mechanical equipment, etc., can solve the problems of affecting the service life of the bearing, the use of woven fabrics may not be suitable or convenient in some bearing applications, and the bearings typically wear more quickly, so as to achieve easy bearing maintenance and good wear performance.

Inactive Publication Date: 2001-01-30
REXNORD CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is directed to coatings with lubricating properties which may be applied by a variety of methods to surfaces of various configurations to provide a law friction surface. The coatings of the invention are useful as self-lubricating coatings for bearings and the like. Bearings coated with coatings described herein have been found to have good wear performance even under high pressure and high temperature conditions required for qualification to military specifications. Such test conditions are more stringent than required for most applications, and are therefore a desirable benchmark to measure wear performance. The coating may also permit easier bearing maintenance. A roller bearing with the coating applied to the inside diameter of the inner race may be capable of being removed from a shaft during maintenance, rather than being cut from the shaft and thereby destroyed.
Injection molding may be a useful application method for bearings such as spherical ball bearings and other parts having small orifices into which the coating mixture may be injected. One advantage of injection is that air tends to be purged from the mixture, which minimizes void problems in the final product, and which facilitates an anaerobic cure.

Problems solved by technology

The use of a woven fabric may not be suitable or convenient in some bearing applications, for example, where only a small orifice may be available into which to inject a coating.
Under high temperature conditions, bearings typically wear more quickly.

Method used

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  • Self-lubricating bearing and coating
  • Self-lubricating bearing and coating
  • Self-lubricating bearing and coating

Examples

Experimental program
Comparison scheme
Effect test

example 1

A self-lubricating bearing is made by preparing a coating and applying it to a bearing as follows: A 1 / 2 inch inner diameter (ID) 2024 aluminum bearing is cleaned by grit blasting with 60 grit aluminum oxide. The bearing is then rinsed in water and cleaned in an ultrasonic cleaner with a weak acidic cleaning solution. The bearing is rinsed in purified deionized water and dried in hot air.

The coating composition is prepared by mixing two batches of monomer in a planetary mixer equipped with a high shear blade. Each batch contains 470 grams (g) of triethylene glycol dimethacrylate and 470 grams of dipentaerythritol pentaacrylate. Mixing occurs under a vacuum of about 25 inches of mercury for about 15 minutes. 2.8 grams of KEVLAR aramid pulp is added to each batch and mixed about 10 minutes. To one batch (part A) is mixed 4.1 grams of benzoyl peroxide in crystal form as an initiator. To the other batch (part B) is mixed 0.5 grams dimethyl-p-toluidine as an accelerator. 590 grams of 1 / 6...

example 2

A mixture of 5 grams dipentaerythritol pentaacrylate (SR-399) and 5 grams triethylene glycol dimethacrylate (SR-205) is admixed with 0.1 grams liquid dispersion of BPO, 0.01 grams DMPT, and 6 grams TEFLON PTFE. The mixture is stirred and applied to the inner diameter of a 1 inch ID bearing cleaned by vapor blasting. The coating is cured at 170.degree. C. for about 24 hours. The coated bearing is subjected to a high temperature oscillation test at 325.degree. F. (163.degree. C.) over 25,000 cycles in accordance with MIL-B-81934. This specification also entails placing the part in an oven and soaking it for 24 hours in one of six fluids commonly used in the aerospace industry, like JP-4 fuel, hydraulic fluids, and anti-icing fluid. The part is placed on a pin and oscillated 10.times. / minute over + / -25 degrees of rotation. The wear of the coating measured less than the maximum allowable wear of 0.0060 inches at 25,000 cycles for the high temperature and fluid-soak conditions, and 0.004...

example 3

A sample coated bearing was prepared as in Example 2 except 10 grams of dipentaerythritol pentaacrylate (SR-399) was used instead of 5 grams each of two different monomers. The bearing was subjected to the same high temperature oscillation test as in Example 2 and also had less than the maximum allowable wear of 0.0060 inches at 25,000 cycles.

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Abstract

A self-lubricating coating is provided which includes a mixture of a curable acrylate composition including a dipentaerythritol pentaacylate and a solid lubricant, such as polytetraflourethylenr. The curable acrylate composition may also include triethylene glycol dimethacrylate. An aramid pulp may also be added to the coating mixture. Also disclosed is a method of manufacturing the coating, and a self-lubricating bearing having the coating disposed on its surface.

Description

This invention relates to self-lubricating coatings, and particularly to self-lubricating coatings useful for bearings.Bearings having a self-lubricating coating are known. For example, U.S. Pat. No. 4,134,842 to Orkin discloses a self-lubricating bearing assembly in which one bearing surface is a woven fabric impregnated with a cured acrylate composition. The use of a woven fabric may not be suitable or convenient in some bearing applications, for example, where only a small orifice may be available into which to inject a coating.In addition, customers demand bearing coatings with good wear properties. Under high temperature conditions, bearings typically wear more quickly. Therefore, a particularly desirable bearing coating would be easy to apply to a variety of surface and would have good wear properties even under high temperature use.SUMMARY OF INVENTIONThe present invention is directed to coatings with lubricating properties which may be applied by a variety of methods to surf...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): C10M111/04C10M111/00C09D4/00C08J5/16
CPCF16C33/201C10M111/04C10M103/00C10M103/02C10M103/06C10M107/28C09D4/00C08F222/1006C08F222/20C10M2201/1006C10M2201/1023C10M2201/1033C10M2201/1053C10M2201/12C10M2201/123C10M2201/16C10M2201/18C10M2209/08C10M2209/084C10M2209/0845C10M2209/0863C10M2211/06C10M2213/02C10M2213/062C10N2240/02C10M2201/00C10M2201/003C10M2201/0403C10M2201/0413C10M2201/0423C10M2201/0433C10M2201/0603C10M2201/061C10M2201/0613C10M2201/0623C10M2201/0653C10M2201/066C10M2201/0663C10M2201/0803C10M2201/0853C10M2201/0863C10M2201/0873C10N2040/02F16C17/02C08F222/105C08F222/102
Inventor RYAN, WILLIAM E.HUBIAK, WILLIAM R.ALLAWAY, JULIA B.FEHRENBACH, JANICE N.STRAUSE, JAMES M.
Owner REXNORD CORP
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